Two novel linear arrangement d10 hexamers with isonicotinic acid: Structures, blue luminescent and semiconducting properties

The reactions of isonicotinic acid (HIso) with metal salts of Ag(I) or Cu(I) yielded two hexamers [Ag6(Iso)6(H2O)2] · H2O (1), [Cu6(Iso)6] · 2H2O (2). 1 and 2 are rare hexanuclear linear arrangement coordination complexes containing HIso. Solid state emission spectra of 1 and 2 show interesting pale blue luminescence with emission peaks in the range of 408 and 438 nm, which are assigned to LMCT. The energy gaps from the absorption spectra are 2.37 eV for 1 and 2.88 eV for 2, showing the present compounds behave as semiconductors.